The Bluetooth of the TV is not suitable for the connection of audio devices in your model, there is a workaround that provides installation Side load of the "Bluetooth Pair" App, after having found the installation package of the App (APK) and having downloaded it via Computer (then transferred to TV via USB memory).
On the TV you can install the application after giving permission to install from "Unknown Sources", there is a MENU item in Android TV.
For the installation you need a File Manager that you can download and install from the Play Store.
Probably now you can pair a Bluetooth audio device.
Manolo
